Electric-arc lamp.



No. 670,658. Patented me. 26, mm.

E. A. BECK.

ELECTRIC ABC LAMP.

(Application filed May 7, 1900.,

Witnemes JZZV/ZZDI UNITED STATES EDGAR A. BEOK, OF LOS PATENT OFFICE.

ANGELES, CALIFORNIA.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters m t No. 670,658, dated March 26,1901.

Application filed May 7, 1900.

To all whom it may concern:

' Be it known that I, EDGAR A. Back, of the city of Los Angeles, in thecounty of Los Angeles, State of California, have invented certain newand useful Improvements in Inclosed Arc-Lamps, of which the following isa full, clear, and exact description or specification, reference beinghad to the annexed drawings and to the letters marked thereon.

My invention has partly for its object to enable the chamber whichincloses the lower carbon and part of the upper carbon of inclosedarc-lamps to be always maintained with an air-tight joint at that partof the inclosing chamber where the upper edge of the glass shade orenvelop is in contact with the cap constituting the upper part of themetallic frame by which the glass shade or envelop, the lower-carbonholder, and the upper-car: bon guide or passage for the upper carboninto the inclosed arc-lamp chamber are maintained in their properoperative relationship. This object is elfected by the construction ofthe metallic parts in such manner whereby certainty is insured that theseveral parts WhGIlESSGlIlblGd for operative use shall so fit togetherthat the joining parts will bear s0 truly and squarely upon each otherthat leakage or admission of air at the aforesaid joint is prevented.

My invention has also for its object toenable the passage or holethrough which the upper carbon passes into the arc-lamp 0113171. ber tomake a practically air tight joint around the upper carbon, whileallowing the requisite freedom of motion of the upper carbon therein asthe upper carbon is consumed, which joint is a mechanically-yieldingjoint and sensitive enough or sufficiently free to allow of the escapeof gas generated in the carbon-inclosing chamber of the lamp, at thesame time preventing the admission of air thereinto during the time thelamp is in action.

My invention has, furthermore, for its object to enable the glassshadeor envelop and the lower carbon to be-easily removed from themetallic framing and other parts of the inclosed arc-lamp chamber and tobe readily replaced therein without separating or taking asunder theparts of the framing, this facility of removal of the glass shade orenvelop be- Serial No. 15,857. (No model.)

ing a resultant of the arrangement and construction of the framing andthe connections of the same, as hereinafter described.

. An advantage also resulting from my improved construction of inclosedarc-lamps is that I am enabled to adjust or trim the en.-

tire inclosed portions thereof when they are removed from the joint orcoupling which connects them with the arc-lamp mechanism on thelighting-circuit. For example, when they are uncoupled or disconnectedfrom the arc-lamp mechanism and taken into a house or apartment of anelectric-lighting plant or station for the purpose of being cleaned andwhen the said parts are again put together after being cleaned I amenabled to ascertain by merely applying the inclosed chamber to themonth and then blowing into the inclosure or inclosing chamber that thejoints are tight before the lamp is replaced for being operated on theline, thus insuring that the lamps when replaced on the line. are devoidof leaky joints and in perfect operative condition.

On the annexed drawings,Figure 1 is a front elevation of my improvedinclosed arc-lamp. Fig. 2 is acorresponding elevation of the same, butwith the upper and lower portions of the glass chamber or envelop brokenaway in order to show the construction of the upper and lower caps ofthe lamp and the packing through which the upper carbon passes. Fig. 2is a side elevation of the said lamp. Fig. 2 is a plan of the upper partof the said lamp. Fig. 3 is an inverted plan of the upper cap of myimproved arc-lamp. Fig. 4 is a transverse section of the portions of theupper cap on a larger scale than shown at Figs. 1, 2, and 3, this Fig.4: showing also the packing for the upper carbon. Fig. 5 is a plan ofthe pack ing for the upper carbon corresponding to Fig. 4, but with theupper cap of the vpacking- 9 is an inside elevation of one of the upperand one of the under segments of the central packing-ring, showing therelationship of the upper and under segments thereof to each other. Fig.10 is an inverted plan of Fig. 9.

In Figs. 1, 2, 2, and 3 the glass shade or envelop of the lamp is markedA. The upper cap-piece is marked B, and the lower cap is marked C. Theupper cap B has attached to it the plate D, to which the rods E arerigidly fastened, the lower ends of these rods E being provided withthumb and finger nuts F, which are attached to fit on the screw-threadedlower terminals of the rods E E. Upon the lower ends of the rods E E theangularly-bent transverse bar G is carried, having holes at the endsthereof passing over the studs 6 e, projectinginwardly from theblocksff, which are formed with holes, so as to slide freely upon therods E E, so that by tightening the nuts F F the spiral springs g g,carried upon the rods E E, are compressed, whereby the upper and lowercaps B and C, respectively, are pressed with any required degree ofelastic pressure upon the upper and lower edges of the glass shade orenvelop A A. The upper and lower caps B and O are provided with a layerof asbestos or other packing H and H, respectively, at the parts wherethese caps bear against or upon the edges of the glass shade orenvelop,as shown at Figs. 2, 3, and 4.

By reason of the rods E E ahd the upper cap B being permanently andrigidly connected togetherin placinglhe glass shade or envelop A intoits place in the lamp-framing and tightening all the parts together bymeans of the nuts F F all the parts constituting the inclosing chamberare held together with the required degree of tension or elasticpressure produced by the intervention of the springs g g, and the uppercap B is insured of bearing squarely upon the upper edge of the chamberor envelopA. The lower cap 0 is also presssd elastically and squarely upagainst the lower edge of the glass chamber of the shade or envelop A bymeans of the springs g g and the adjustable central screw I, while thearrangement is such as to admit of the glass shade or chamber A beingreadily removed from the framing of the inclosed arc-lamp by merelypulling down the bar G G by applying the thumb and finger to the head ofthe thumb-screw I, which enables the bar G G to be swung on its studs ee into the position shown at Fig. 2, in which position the shade orenvelop A and the lower carbon are set free from the other parts of theinclosed arc-lamp. By means of this arrangement whereby the rods E E arerigidly connected to the plate D and the upper cap A A, and whereby,too, the under cap 0 is pressed upward by means of the adjustabletransverse rod G, screw-nuts F F, springs g g, and screw I the certaintyis insured that the joints at the upper and lower ends of the glasschamber or envelop A are at all times airtight without any great carebeing exercised on the part of the attendant or trimmer of the inclosedarc-lamps, and in practice I find that by means of this construction ofthe hereinbefore-described parts of an inclosed arc-lamp leaky joints atthe upper and lower ends of the glass envelop or chamber, and especiallyat the upper end of the glass envelop or chamber, are entirely got ridof.

The lower cap 0 is provided with set-screws J for adjusting therelationship of the cap with the lower edge of the envelop A.

The packing surrounding the upper carbon K consists of two or moresuperposed segmental rings. In the drawings two such rings are shown,the segments constituting the upper of which rings are marked L, L, L,and L in Fig. 5, and the segments constituting the lower of which ringsare marked M, M, M, and M in Fig. 6. The upper ring, composed of thesegments L, L, L, and L, has a recess formed in its under side, as shownat Fig. 6, whereinto the segments constituting the lower ring M, M, M,and M fit, and the transverse joints of the two rings L, L, L, and L andM M M M--namely, the joints marked (1. a a a and bbb bin Figs. 5 and 6,respectivelyare so arranged that the transverse joints 1) b b I) breakjoint with the transverse joints or (t a a, the several partsconstituting these two segmental rings and their joints beingsuificiently well fitted together as to enable them to bear withsufficient closeness upon each other to practically prevent ablow-through between or among the several joints,the break-joint of theparts materially aiding to produce the close fitting or tightness ofsaid joints.

By reference to Figs. 7, 8, 9, and 10 the construction of each segmentconstituting the packing-ring will be easily understood, and it is hereexplained that in order to maintain the several segments in therequisite brealc jointed positions when the ring is in its place andoperatingin the inclosed arc-lamp one of the lower segments and uppersegments are held together by means of a stop-pin, as shown at 0, Figs.5, 6, 8, and 10 ot' the drawings.

The hole Nin the center of thepacking-ring, Figs. 5, 6, 8, and 10, is ofthe size requisite to allow the upper carbon K to pass therethrough.

As shown at Figs. 4 and 5, the upper exterior packing-ring, composed ofthe segments L, L, L, and L, is preferably formed slightly tapered atits exterior, and in the annular inclosure 0, around about the packingring, a number of metallic weights, preferably in the form or shape ofspheres P, are contained. The lower part of the annular inclosure 0 isslightly inclined downward toward the segments of the packing-ring L L LL, so that the tendency of the metallic weights P P P is to press byreason of their spherical shape or form upon the exterior of thepacking-ring, and thereby to press the segments of the said packing-ringevenly and concentrically all around the upper carbon, by

which arrangement gas generated within the inclosed chamber of the lampto which pressure is or may be imparted by reason of heat producedwithin the lamp is allowed to escape through the yielding of thesegments to such gas-pressure, while air from without is prevented fromentering into the lamp when the lamp is in operation. The segmentalpackingrings L L L" L and M M M M, together with the weightsP P P, aremaintained within the inclosure O by means of the cap Q, which isscrewed upon the inclosure O, as shown at Figs. 2 and 4:. The lower partof the chamber constituting the inclosure O is provided with a tubularprojection R, Figs. 2 and 4., upon which the screwed nut S is carried,the

object of which is not only to fasten the inclosure 0 and the packingwithin it to the upper cap B and plate D of the lamp, but also to enablethe ordinary coupling-inclosure T, the plate U, and the rods V V of thearclamp mechanism to be insulated from the cappiece B and the uppercarbon. The ring T, which is of akind commonly used, makes electricalconnection with the plate D and thence through the rods E E, bar G, andscrew I with the lower carbon W.

Having now described the nature of my said invention and the bestsystem, mode, or manner I am at present acquainted with for carrying thesame into practical efiect, I desire to observe, in conclusion, thatwhat I consider to be novel and original, and therefore claim as theinvention to be secured to me by Letters Patent, is as follows:

1. The inclosed arc-lamp wherein the joint of the upper end of the glassenvelop with the cap is maintained by an extension of the capplate ateither side, each such extension having a vertical rod rigidly attachedthereto, so that the cap and these rods always maintain a constantrelationship of immovability with respect to each other, while the capat the lower end of the glass shade is carried and pressed verticallyupward by a transverse bar, elastically suspended by springs andadjusting-n uts upon said rods, said transverse bar having a centraladjustable projection bearing upward against the bottom cap of the lamp,and said bar being carried upon pivots or studs forming, part of asliding block on each of the rods all constructed and operatingsubstantially as hereinbefore described.

2. That part of an inclosed arc-lamp consisting of the upper cap andplate insulated from the upper carbon, the vertical rods rigidlyattached to the upper plate, the sliding blocks with pivots at the lowerpart of these rods, the transverse bar movable on the pivots of thesesliding blocks with pivots, the springs for forcing the sliding blockswith pivots andt-ransverse bar upward for maintaining the shade orenvelop air-tight against the upper and lower seats of the shade orenvelop, the screw n uts and threads on the lower parts of the rods andthe cap for closing the bottom of the shade or envelop, all operatingtogether substantially as hereinbefore set forth.

3. In an inclosed arc-lamp the combination of the glass shade, the capat the top of the glass shade the rods rigidly attached to this cap, thepivoted transverse bar, the pivotal sliding blocks, the cap at the lowerend of the glass shade, the projecting screw at the center of thetransverse bar bearing against the center of the lower cap, the nuts onthe screwthreaded lower ends of the rods, the spiral springs on saidrods, the glass shade or envelop, all substantially as hereinbeforedescribed.

4. In an inclosed arc-lamp the combination of the glass shade, the capat the top of the glass shade, the vertical rods rigidly attached tothis cap, the pivoted transverse bar, the pivotal sliding blocks, thecap at the lower end of the glass shade, the projecting screw at thecenter of the pivoted transverse bar bearing against the center of thelower cap, the nuts and the spiral springs on the screwthreaded lowerends of the vertical rods, the glass shade or envelop, all operating toproduce air-tight joints at the upper and lower ends of the glass shadeand the air-tight packing carried by the upper cap and around the uppercarbon, andthe insulation, all constructed and Operating substantiallyas hereinbefore described.

5. The packing for the upper carbon consisting of a central ring portionconstructed of segments in layers breaking joint with each other andpressed peripherally against the upper carbon by a series of weightscontained within a casing and arranged so that the weights constantlypress peripherally against the segmental ring, the joints of thesegments of one ring breaking joint with the segments of the next ring,substantially as hereinbefore described.

6. The casing or inclosure containing the segmental rings, the segmentalrings, the segmental joints of one ring breaking joint with thesegmental joints of another ring, the weights withih said casing orinclosure pressed against the segmental ring, the screw-thread edtubular stemat the under side of said casing, or inclosure, the nutthereon and the insulating-rings for said packing and the upper carbonfrom the lower carbon of an inclosed arc-lamp, substantially ashereinbefore described.

In testimony'whereof I have hereunto set my hand and-seal, this 9th dayof April, in the year of our Lord 1900, in the presence of twosubscribing witnesses.

EDGAR A. BECK. [L. s.]

Witnesses:

ST. JOHN DAY, ARTHUR J. GARFIELD.

